AC Transmission Emulation Control Strategies for the BTB VSC HVDC System in the Metropolitan Area of Seoul

Sungyoon Song, Jongin Kim, Junghun Lee and Gilsoo Jang
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Sungyoon Song: School of Electrical Engineering, Korea University, Anam-ro, Sungbuk-gu, Seoul 02841, Korea
Jongin Kim: School of Electrical Engineering, Korea University, Anam-ro, Sungbuk-gu, Seoul 02841, Korea
Junghun Lee: School of Electrical Engineering, Korea University, Anam-ro, Sungbuk-gu, Seoul 02841, Korea
Gilsoo Jang: School of Electrical Engineering, Korea University, Anam-ro, Sungbuk-gu, Seoul 02841, Korea

Energies, 2017, vol. 10, issue 8, 1-15

Abstract: In the Korean power system, growing power loads have recently created the problems of voltage instability and fault current in the Seoul Capital Area (SCA). Accordingly, the back-to-back (BTB) voltage source converter (VSC) high-voltage direct-current (HVDC) system is emerging to resolve such problems with grid segmentation. However, non-convergence problems occur in this metropolitan area, due to the large change of power flow in some contingencies. Therefore, this paper proposes two kinds of AC transmission emulation control (ATEC) strategies to improve the metropolitan transient stability, and to resolve the non-convergence problem. The proposed ATEC strategies are able to mitigate possible overloading of adjacent AC transmission, and maintain power balance between metropolitan regions. The first ATEC strategy uses a monitoring system that permits the reverse power flow of AC transmission, and thus effectively improves the grid stability based on the power transfer equation. The second ATEC strategy emulates AC transmission with DC link capacitors in a permissible DC-link voltage range according to angle difference, and securely improves the gird stability, without requiring grid operator schedule decisions. This paper compares two kinds of ATEC schemes: it demonstrates the first ATEC strategy with specific fault scenario with PSS/E (Power Transmission System Planning Software), and evaluates the second ATEC strategy with internal controller performance with PSCAD/EMTDC (Power System Electromagnetic Transients Simulation Software).

Keywords: back-to-back HVDC; AC transmission emulation control; voltage source converter; angle difference (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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